CET PMC-T402 User Manual

PMC-T402

Temperature & Iresidual Monitor

User Manual

Version: V1.0

November 09, 2017

CET Inc.

This manual may not be reproduced in whole or in part by any means without the express
written permission from CET Electric Technology (CET).
The information contained in this manual is believed to be accurate at the time of publication;
however, CET assumes no responsibility for any errors which may appear here and reserves
the right to make changes without notice. Please consult CET or your local representative for
the latest product specifications.

DANGER

This symbol indicates the presence of danger that may result in severe injury or death and
permanent equipment damage if proper precautions are not taken during the installation,
operation or maintenance of the device.

CAUTION

This symbol indicates the potential of personal injury or equipment damage if proper
precautions are not taken during the installation, operation or maintenance of the device.

2

Installation, operation and maintenance of the device should only be
performed by qualified, competent personnel that have the appropriate
training and experience with high voltage and current devices. The device must

Ensure that all incoming AC power and other power sources are turned OFF

Before connecting the device to the power source, check the label on top of
the device to ensure that it is equipped with the appropriate power supply, and

During normal operation of the device, hazardous voltages are present on its
terminal strips and throughout the connected potential transformers (PT) and

current transformers (CT). PT and CT secondary circuits are capable of

generating lethal voltages and currents with their primary circuits energized.
Follow standard safety precautions while performing any installation or service

Do not use the device for primary protection functions where failure of the
device can cause fire, injury or death. The device should only be used for

Under no circumstances should the device be connected to a power source if

To prevent potential fire or shock hazard, do not expose the device to rain or

Setup procedures must be performed only by qualified personnel familiar with

DANGER

Failure to observe the following instructions may result in severe injury or

death and/or equipment damage.



be installed in accordance with all local and national electrical codes.



before performing any work on the device.



the correct voltage and current input specifications for your application.

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

work (i.e. removing PT fuses, shorting CT secondaries, …etc).



shadow protection if needed.



it is damaged.



moisture.



the instrument and its associated electrical equipment.

 DO NOT open the instrument under any circumstances.

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Limited warranty

CET offers the customer a minimum of 12-month functional warranty on the
device for faulty parts or workmanship from the date of dispatch from the

CET does not accept liability for any damage caused by device malfunctions. CET
accepts no responsibility for the suitability of the device to the application for

Failure to install, set up or operate the device according to the instructions herein

Only CET’s duly authorized representative may open your device. The unit should
only be opened in a fully anti-static environment. Failure to do so may damage



distributor. This warranty is on a return to factory for repair basis.



which it was purchased.



will void the warranty.



the electronic components and will void the warranty.

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Table of Contents

Chapter 1 Introduction ........................................................................................................................ 7

1.1 Overview............................................................................................................................... 7

1.2 Features ................................................................................................................................ 7

1.3 Getting more information ..................................................................................................... 8

Chapter 2 Installation .......................................................................................................................... 9

2.1 Appearance ........................................................................................................................... 9

2.2 Dimensions ......................................................................................................................... 10

2.2.1 Main Unit ................................................................................................................. 10

2.2.2 Terminal ................................................................................................................... 10

2.2.3 Residual Current CTs ................................................................................................ 11

2.2.4 PT100 ....................................................................................................................... 12

2.3 Mounting ............................................................................................................................ 12

2.4 RS-485 Wiring ..................................................................................................................... 14

2.5 Digital Output Wiring .......................................................................................................... 14

2.6 Residual Current Input Wiring ............................................................................................. 14

2.7 RTD Input Wiring ................................................................................................................. 15

2.8 Power Supply Wiring ........................................................................................................... 15

Chapter 3 Front Panel ....................................................................................................................... 16

3.1 LED Indicator ....................................................................................................................... 16

3.2 Buttons ............................................................................................................................... 16

3.3 LED Display ......................................................................................................................... 17

3.3.1 LED Display Symbols ................................................................................................. 17

3.3.2 LED Testing ............................................................................................................... 17

3.3.3 Default Display ......................................................................................................... 17

3.3.4 Data Display ............................................................................................................. 18

3.3.5 SOE Display .............................................................................................................. 18

3.4 Setup Configuration ............................................................................................................ 19

3.4.1 Making Setup Changes ............................................................................................. 19

3.4.2 Setup Menu ............................................................................................................. 20

3.4.3 Configuration ........................................................................................................... 21

Chapter 4 Applications ...................................................................................................................... 23

4.1 Condition Monitoring .......................................................................................................... 23

4.1.1 Residual Current Monitoring .................................................................................... 23

4.1.2 Temperature Alarm .................................................................................................. 23

4.2 Digital Output ..................................................................................................................... 25

4.3 SOE Log ............................................................................................................................... 25

Chapter 5 Modbus Register Map ....................................................................................................... 26

5.1 Basic Measurements ........................................................................................................... 26

5.2 SOE Log ............................................................................................................................... 27

5.3 Device Setup ....................................................................................................................... 28

5.4 Time .................................................................................................................................... 29

5.5 Remote Control ................................................................................................................... 30

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5.6 Device Information.............................................................................................................. 30

Appendix A Technical Specifications .................................................................................................. 31

Appendix B Standards of Compliance ................................................................................................ 32

Appendix C Ordering Guide ............................................................................................................... 33

Contact us ......................................................................................................................................... 34

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Chapter 1 Introduction

This manual explains how to use the PMC-T402 Temperature & Iresidual Monitor.

This chapter provides an overview of the PMC-T402 and summarizes many of its key features.

1.1 Overview

The PMC-T402 is CET’s latest offer for the Temperature (RTD) and Residual Current monitoring for the
Commercial and Industrial markets. Housed in a compact form factor measuring only
72(L)×72(H)×87.8(D)mm, the PMC-T402 can be used as a stand-alone device that offers real-time
monitoring and alarming of Residual Current and Temperature with its LED display, Front Panel buttons,
1xDO for Alarm Output or General Purpose Control and a built-in Alarm Buzzer. With the standard RS­485 port and Modbus RTU protocol support, the PMC-T402 becomes a vital component of an
intelligent, centralized Condition Monitoring.

 Intelligent Electrical Fire and Condition Monitoring for Industrial or Commercial facilities
 Industrial and Commercial Electrical Power System
 AC Low Voltage Distribution System
 Condition monitoring of electrical equipment

1.2 Features

Ease of use

 Bright 2-line LED display with high visibility for Temperature and Residual Current measurements
 LED Indicators for Run, Fault, Warning, Alarm, Comm. Activities, Measurement Channel and Unit

indicators

 Built-in Alarm Buzzer
 Password-protected setup via front panel or free PMC Setup software
 Panel or DIN Rail (with adapter) Mount
 Support Firmware Upgrade over Communications

Residual Current Measurement

 4 channels Residual Current Input (CT not included)
 Two Setpoint Alarm Levels between 20 and 1000mA

Temperature Measurement

 4 channels RTD Input (PT100 sensor not included)
 Two Setpoint Alarm levels between 45°C and 140°C

SOE Log

 64 events time-stamped to ±1ms resolution
 Setup changes, Setpoint Alarms, Power Reset …etc.

Digital Output

 1 Form A mechanical DO (3A @ 250VAC or 30VDC)
 Can be used for Alarm Output or General Purpose Control

Communications

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 1xRS-485 port @ 9600bps, 8E1
 Modbus RTU protocol

1.3 Getting more information

Additional information is available from CET via the following sources:

 Visit www.cet-global.com
 Contact your local representative
 Contact CET directly via email at [e-mail]

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Installation of the PMC-T402 should only be performed by qualified, competent personnel
that have the appropriate training and experience with high voltage and current devices.

During the operation of the monitor, hazardous voltages are present at the input terminals.
Failure to observe precautions can result in serious or even fatal injury and equipment

damage.

Chapter 2 Installation

Caution

The monitor must be installed in accordance with all local and national electrical codes.

2.1 Appearance

Figure 2-1 Appearance

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2.2 Dimensions

2.2.1 Main Unit

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2.2.2 Terminal

Figure 2-2 Main Unit Dimensions

Figure 2-3 Terminal Dimensions

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Terminal

Terminal Dimension (mm)

Wire Size (mm2)

Max. Torque

1

DO & RS-485

2.5 x 2.8

1.5

4.5 kgf.cm/M2.5
(3.9 lb-in)

2

TCn

3

IRn

4

Power Supply

6.0 x 6.0

1.0mm2 - 2.5mm2

(14AWG - 22AWG)

6.0 kgf.cm/M3
(5.2 lb-in)

2.2.3 Residual Current CTs

 PMC-MIR-46 (160A, Ø=46mm)

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Table 2-1 Terminal Dimensions

Figure 2-4 PMC-MIR-46 Dimensions

 PMC-MIR-80 (400A, Ø=80mm)

Figure 2-5 PMC-MIR-80 Dimensions

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 PMC-MIR-120 (1000A, Ø=120mm)

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Figure 2-6 PMC-MIR-120 Dimensions

 PMC-MIR-220x50 (630A, 220x50mm)

Figure 2-7 PMC-MIR-220x50 Dimensions

2.2.4 PT100

Figure 2-8 PT100 Dimensions

2.3 Mounting

The PMC-T402 should be installed in a dry environment with no dust and kept away from heat,
radiation and electrical noise source. The PMC-T402 supports two installation modes: Panel mount
and DIN-Rail mount.

 Panel Installation steps:

o Remove the installation clips from the PMC-T402
o Fit the PMC-T402 through a 68mm x 68mm cutout as shown in Figure 2-9
o Re-install the installation clips and push the clips tightly against the panel to secure the PMC-

T402

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Figure 2-9 Panel Installation

 DIN-Rail Installation steps:

o Before installation, please make sure that the DIN rail and the adapter are already in place.
o Remove the installation clips from the PMC-T402
o Fit the PMC-T402 through the adapter as shown in Figure 2-10
o Re-install the installation clips and push the clips tightly against the adapter to secure the

PMC-T402

Figure 2-10 DIN-Rail Installation

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2.4 RS-485 Wiring

The PMC-T402 provides a standard RS-485 port that supports the Modbus RTU protocol. Up to 32
devices can be connected on a RS-485 bus. The overall length of the RS-485 cable connecting all
devices should not exceed 1200m.

If the master station does not have a RS-485 communications port, a RS-232/RS-485 or USB/RS-485
converter with optically isolated outputs and surge protection should be used. The following figure
illustrates the RS-485 connections on the PMC-T402.

Figure 2-11 RS-485 Connections

2.5 Digital Output Wiring

The following figure illustrates the Digital Output connections on the PMC-T402:

Figure 2-12 DO Connections

2.6 Residual Current Input Wiring

The following figures illustrate the Residual Current Input connection on the PMC-T402 and typical
wiring with a 3P4W system, respectively:

Figure 2-13 Residual Current Input Connections

Notes:

1) The Residual Current terminals (either IR11 or IR12) should be left open and should not be connected to ground if unused.
Otherwise, doing so would damage the device.

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2) The alarming feature of the Residual Current measurement is disabled by default and can be enabled via the Front Panel or
through communications.

3) Please ensure that the device power is OFF when connecting the Residual Current CT.

2.7 RTD Input Wiring

The following figure illustrates the Temperature Input connections on the PMC-T402:

Figure 2-14 Temperature Input Connections

Notes:

1) The alarming feature of the Temperature measurement is disabled by default and can be enabled via the Front Panel or
through communications.

2) Please ensure that the device power is OFF when connecting the RTD.

2.8 Power Supply Wiring

The following figure illustrates the Power Supply connections on the PMC-T402:

Figure 2-15 Power Supply Connections

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LED Indicator

Color

Description

Run

Green

Blinking when the system is running normally

IR1~IR4

TC1~TC4

Green

Lit if the corresponding IRn or TCn measurement or Alarm/Fault event is
displayed

Warn

Red

Lit if any measurement has breached the Warning Setpoint Limit

Alarm

Red

Lit if any measurement has breached its Alarm Setpoint Limit

Mute

Green

Lit if the activated buzzer is muted (by pressing < /Mute> button)

Comm.

Green

Blinking when communicating

mA/°C/s

Green

Lit to display the present measurement unit

Buttons

Data Display Mode

Setup Configuration Mode

Alarm/Fault Mode

< /Diag.>

Pressing this button
scrolls to the next
available parameter
or menu item.

If the selected parameters is a
numeric value, pressing this
button moves the cursor to
the left by one position. Once
the cursor has reached the
left most digit, pressing this
button returns to the first
digit.

Pressing this button
queries other Fault or
Alarm events under the
event display screen.

< /Mute>

Pressing this button
scrolls to the
previous available
parameter or menu
item.

 If the selected parameter is

a numeric value, pressing
this button increments the
selected digit. Once the
number reaches to 9,
pressing this button again
will become to 0.

 If the selected parameter is

an enumerated value,
pressing this button scrolls
through the enumerated

 When the buzzer is

active due to an Alarm
or a Fault, pressing this
button for one second
mutes the sound.

 Under an Alarm event

screen, pressing this
button switches to the
Fault event screen.

Chapter 3 Front Panel

The PMC-T402 has a bright 2-line LED display and 4 buttons for both data display and setup
configuration purposes.

Figure 3-1 Front Panel Display

3.1 LED Indicator

There are 17 LED indicators on the PMC-T402’s front panel as described below:

Table 3-1 LED Indicators

3.2 Buttons

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list.

< /Enter>

This button is
ignored in the Data
Display mode.

 Pressing this button for

three seconds toggles
between Data Display mode
and Setup Configuration
Mode.

 Once inside the Setup

Configuration mode,
pressing this button selects
a parameter for
modification. After
changing the parameter,
pressing this button again
saves the new setting into
memory.

This button is ignored in
the Alarm/Fault Mode.

< /Esc>

Pressing this button
returns to the
previous menu
level.

Press this button to discard
the changes or cancel the
current operation.

Pressing this button for
three seconds to reset the
Alarm and Fault.

Label

Description

A

B

C

D

E

F

G

H

I

J

K

L

M

N

O

P

Q

R

S

T

U

V

W

Y

0

1

2

3

4

5

6

7

8

9

Table 3-2 Buttons Description

3.3 LED Display

3.3.1 LED Display Symbols

The following table shows the special LED display symbols:

3.3.2 LED Testing

Pressing < /Diag.> button for one second enters the LED Testing mode. During testing, all LED
segments and indicators are illuminated for 1 second. This cycle will repeat 6 times to allow for the
detection of faulty LED segments or indicators. In addition, the Alarm Buzzer will sound for 3 seconds
first and then short sound for 3 times during illumination LED segments and indicators. The LED will
return to its normal display mode afterwards.

3.3.3 Default Display

The PMC-T402 has a Default Display that shows the IR1 and IR2 parameters as shown below. The user
can use the < /Diag.> and < /Mute>> buttons to scroll and display other parameters. Please refer
to Section 3.2 above for a complete description of the front panel and button operations.

Table 3-3 LED Display Segments

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Menu

Display screens

Measurements

IRn

Display 1

IR1

IR2

Display 2

IR3

IR4

TCn

Display 1

TC1

TC2

Display 2

TC3

TC4

DO

Display 1

DO Status

Figure 3-2 Default Display

3.3.4 Data Display

The following table illustrates the available measurements under the Data Display Mode.

Table 3-4 PMC-T402 Data Display Pages

3.3.5 SOE Display

The PMC-T402 can display Alarm/Fault events on its LED. The users can scroll the display screens by
pressing < /Diag.> button. When there is an Alarm or a Fault event:

 The Front Panel displays the Alarm/Fault channel and the detailed information
 The Alarm buzzer would sound
 The correspond IRn/TCn LED indicator and Alarm/Fault indicator would be lit

The Alarm event has a higher priority than the Fault event. Users can press < /Mute> button to switch
to the Fault event screen. Once there is no more Alarm or Fault event, the display will return to the
Default Display screen automatically. In addition, users can query other Fault or Alarm events by
pressing < /Diag.> under an event screen.

Examples of Event Log Display:

IRn/TCn Alarm Events:

Figure 3-3 IRn/TCn Alarm Events

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IRn/TCn Fault Events:

Figure 3-4 IRn/TCn Fault Events

3.4 Setup Configuration

3.4.1 Making Setup Changes

1) Entering the Password:
 Press < /Enter> for three seconds to enter Setup Configuration mode, and the LED displays

PROG.

 Press < /Diag.> to advance to the Password page.
 A correct password must be entered before changes are allowed. The factory default password is

“0000”.

 Press< /Diag.> to shift the cursor to the left by one position and press < /Mute> to increment

the numeric value for the password.

 When the password has been entered, pressing < /Diag.> or < /Mute> advances to the setup

menu if the password is correct.

2) Selecting a parameter to change:

 Press < /Diag.>or < /Mute> to scroll to the desired sub-menu or parameter.
 Press < /Enter> to select the sub-menu or parameter. Once a parameter has been selected, its

value will blink.

3) Changing and saving a setup parameter:

 For a Numeric parameter, press < /Diag.> to shift the cursor to the left by one position. Press <

/Mute> to increment the numeric value

 For an Enumerated parameter, press < /Mute> to scroll through the enumerated list.
 After modification, press < /Enter> to save the change into memory or < /Esc> to exit the

currently selected parameter without change.

 Repeat step 3) until all setup parameters have been changed.

4) Exiting the Setup Mode

 Press < /Enter> for three seconds to return to the Display Mode.
 Also, the Setup Mode will be automatically exited if there is a period of inactivity of 5 minutes or

longer.

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3.4.2 Setup Menu

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Figure 3-5 Setup Menu

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Label

Description

Range

Default

Menu

Main Sub

PROG

Setup Configuration

/

/

PASS

Enter Password

0 to 9999

0

COM1 Set Comm. Parameters

Yes/No Id

Set Unit ID

1 to 247

100

FP

Set Setpoint Parameters

Yes/No

IRn

Set IRn Alarm parameters (n=1, 2, 3, 4)

SEL

IRn Alarm Setpoint

0=OFF

1=DO Alarm

2=No DO Alarm

0

VAL

IRn Alarm Limit

20 to 1000 mA

500

dLY

IRn Alarm Time Delay

0 to 20s

5s

PSEL

IRn Warning Setpoint

0=OFF

1=DO Warning

2=No DO Warning

0

rAIo

IRn Warning Level Ratio

0.1 to 0.8

0.6

PdLY

IRn Warning Time Delay

0 to 20s

5s

TCn

Set TCn Alarm parameters (n=1, 2, 3, 4)

SEL

TCn Alarm Setpoint

0=OFF

1= DO Alarm

2=No DO Alarm

0

VAL

TCn Alarm Limit

45 to 140°C

100°C

dLY

TCn Alarm Time Delay

0 to 40s

0s

PSEL

TCn Warning Setpoint

0=OFF

1=DO Warning

2=No DO Warning

0

rAIo

TCn Warning Level

0.1 to 0.8

0.6

PdLY

TCn Warning Time Delay

0 to 40s

0s

DO

Set DO parameter

do

DO pulse width

0 to 6000 (x0.1) s

1.0s

RES FP

Set other Alarm parameters

TCCP

Enable RTD Compensation2

0=OFF

1=ON 1 TCTH

Temperature threshold3

0 to 45°C

0°C

IRTH

Residual Current threshold3

10 to 500mA

20mA

dT

Set Clock

D Enter the Current Date

YY-MM-DD / T

Enter the Current Time

HH:MM:SS

/

MT

PASS SET

Set New Password

nEW

Enter New Password

0 to 9999

0

SoE ALM SoE

Display Alarm events

FAIL SoE

Display Fault events

MT SoE

Display Maintenance events

Clr SoE

Clear SOE

Yes/No

InFo

View Device Information (Read Only)

Yes/No

V

Firmware Version

For example, 1.00.00

means the firmware

version is V1.10.00.

/

Pro

Protocol Version

e.g. 1.0 means V1.0 / d

Firmware Update Date

e.g. 20160915

/

3.4.3 Configuration

The Setup Configuration mode provides access to the following setup parameters:

Notes:

1) The PMC-T402 only supports the configuration of Unit ID for its Com port. The default settings

for Baud Rate and Data Format are 9600 bps and 8E1, respectively and cannot be changed from
the Front Panel.

2) In general, the RTD sensor comes standard with a 3m wire, and the wiring resistance may lead to

a relatively large error, it is recommended that the RTD Sensor Compensation be used to reduce

Table 3-5 Setup Parameters

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the error if the length of the wire exceeds 3m.

3) When the measurements of the Residual Current or Temperature are less than the Residual

Current or Temperature Threshold, the measurements will be displayed as 0.

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Setup Parameter

Definition

Default

IRn Alarm Setpoint

OFF / DO Alarm / No DO Alarm

OFF

Alarm Limit

20 to 2000mA

500mA

Time Delay

0 to 20s

5s

Active Condition

I

residual

≥ Alarm Limit

Inactive Condition

I

residual

< 0.9 * Alarm Limit

Alarm Trigger

SOE, Alarm Buzzer, LED and/or DO

Setup Parameter

Definition

Default

IRn Warning Setpoint

OFF / DO Warning / No DO Warning

OFF

Warning Level

0.1 ~ 0.8

0.6

Time Delay

0 to 20s

5s

Active Condition

I

residual

≥ Alarm Limit * Warning Level

Inactive Condition

I

residual

< 0.9 * [Alarm Limit * Warning Level]

Warning Trigger

SOE, Alarm Buzzer, LED and/or DO

Chapter 4 Applications

4.1 Condition Monitoring

PMC-T402 provides intelligent condition monitoring of Residual Current and Temperature through
external Residual CTs and PT100 Temperature Probes. It can determine if the sensors are working
normally, the setpoint limits have been breached or if the wires of the sensors are broken. The device
can be configured to generate an alarm using the on-board buzzer and activate the Digital Output for
external control when a measurement exceeds the pre-set alarm limit. In addition, a SOE Event would
be generated.

4.1.1 Residual Current Monitoring

The PMC-T402 supports up to four Residual Current Inputs and provides two Setpoint levels between
20 and 1000mA: Warning and Alarm. If the Residual Current measurements exceed the pre-set limits,
the Residual Current Setpoint will become active. The monitoring of Residual Current provides an
indication of the amount of Leakage Current existing in the electrical system as a result of degraded
insulation or poor wiring and acts as an early warning system to alert users of potential safety hazards
as well as the health of the electrical system.

The PMC-T402’s Residual Current inputs are required to be paired with CET’s PMC-MIR series of
Residual CT. Please refer to Section 2.2.3 and Appendix A for their dimensions and specifications.

Residual Current Setpoint parameters can be programmed via the Front Panel or through
communications:

Table 4-1 Residual Current Alarm Setpoint Parameters

Table 4-2 Residual Current Warning Setpoint Parameters

The following figures illustrate the logic diagrams of the Residual Current Alarm and Warning.

Figure 4-1 Residual Current Alarm Logic Diagram

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Setup Parameter

Definition

Default

TCn Alarm Setpoint

OFF / DO Alarm / No DO Alarm

OFF

Alarm Limit

45 to 140 °C

100 °C

Time Delay

0 to 40s

5s

Active Condition

Temperature ≥ Alarm Limit

Inactive Condition

Temperature < 0.9 * Alarm Limit

Alarm Trigger

SOE, Alarm Buzzer, LED and/or DO

Setup Parameter

Definition

Default

TCn Warning Setpoint

OFF / DO Warning DO / No DO Warning

OFF

Warning Level

0.1 ~ 0.8

0.6

Time Delay

0 to 40s

5s

Active Condition

Temperature ≥ Alarm Limit * Warning Level

Inactive Condition

Temperature < 0.9*[Alarm Limit * Warning Level]

Warning Trigger

SOE, Alarm Buzzer, LED and/or DO

Figure 4-2 Residual Current Warning Logic Diagram

Notes:

1) The IRn Alarm or Warning must return to Normal first before a new Alarm or Warning would be generated.

4.1.2 Temperature Alarm

The PMC-T402 supports up to four PT100 Temperature Inputs and provides two Setpoint levels
between 45 and 140°C: Warning and Alarm. If the temperature measurements exceed the pre-set
alarm limit, the Temperature Setpoint will become active. The PMC-T402’s Temperature inputs provide
a way to monitor the temperature condition of a certain piece of equipment and acts as an early
warning system to alert users of potential safety hazards as a result of over-heating.

The PMT-T402’s Temperature inputs are required to be pared with external 2-wire PT100 sensors,
please refer to Section 2.2.4 and Appendix A for its dimensions and specifications.

The Temperature Setpoint parameters can be programmed via the Front Panel or through the
communications:

Table 4-3 Temperature Alarm Setpoint Parameters

Table 4-4 Temperature Warning Setpoint Parameters

The following figures illustrate the logic diagrams of the Temperature Alarm and Warning.

Figure 4-3 Temperature Alarm Logic Diagram

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Figure 4-4 Temperature Warning Logic Diagram

Notes:

1) The TCn Alarm or Warning must return to Normal first before a new Alarm or Warning would be generate.

4.2 Digital Output

The PMC-T402 comes standard with one Form A mechanical DO (3A @ 250VAC or 30VDC). Digital
Outputs are normally used for Alarm Output or Remote Control applications.

1) Alarm Output The Residual Current Alarm and Temperature Alarm Setpoint can

be configured to trigger DO actions in response to the Residual
Current Alarm or Temperature Alarm becoming active. Please
refer to Section 4.1.1 and 4.1.2 for a detailed description.

2) Remote Control Remotely operated over communications via our free PMC Setup

software or PecStar® iEMS Integrated Energy Management
System.

The Remote Control has a higher priority than the Alarm Output, meaning that even if the DO has been
configured to operate in response to an Alarm, it may still be overridden for remote control operation.

4.3 SOE Log

The PMC-T402 has a SOE Log that can store up to 64 events such as Power-On, Alarm, DO action and
Setup changes …etc. in its non-volatile memory. Each event record includes an Event Classification, its
relevant parameter values and a timestamp in ±1 ms resolution.

All events can be retrieved via the Front Panel or through communications. If there are more than 64
events, the newest event will replace the oldest event on a First-In-First-Out basis. The SOE Log can be
reset from the Front Panel or via communications.

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Format

Description

UINT16/INT16

Unsigned/Signed 16-bit Integer

UINT32/INT32

Unsigned/Signed 32-bit Integer

Float

IEEE 754 32-bit

Single Precision Floating Point Number

Register

Property

Description

Format

Scale

Unit

40000

RO

SOE Pointer

1

UINT32

40002

RO

I

residual

Self-Diagnostic Status

2

UINT16

40003

RO

Temp. Self-Diagnostic Status

3

UINT16

40004

RO

I

residual

Alarm Status4

UINT16

40005

RO

I

residual

Warning Status

5

UINT16

40006

RO

Temp. Alarm Status

6

UINT16

40007

RO

Temp. Warning Status

7

UINT16

40008

RO

Reserved

UINT16

40009

RO

Reserved

UINT16

40010

RO

Global Fault/Alarm Status8

UINT16

40011

RO

DO Status9

UINT16

40012

RO

IR1 (RMS)10

UINT16

x10

mA

40013

RO

IR2 (RMS)10

UINT16

40014

RO

IR3 (RMS)10

UINT16

40015

RO

IR4 (RMS)10

UINT16

40016

RO

TC1

10

INT16

x10

°C

40017

RO

TC210

INT16

40018

RO

TC310

INT16

40019

RO

TC410

INT16

40020

RO

IR1 (Fundamental)

UINT16

x10

mA

40021

RO

IR2 (Fundamental)

UINT16

40022

RO

IR3 (Fundamental)

UINT16

40023

RO

IR4 (Fundamental)

UINT16

Chapter 5 Modbus Register Map

This chapter provides a complete description of the Modbus register map (Protocol Version 1.1) for
the PMC-T402 to facilitate the development of 3rd party communications driver for accessing
information on the PMC-T402. For a complete Modbus Protocol Specification, please visit
http://www.modbus.org. The PMC-T402 supports the following Modbus functions:

1) Read Holding Registers (Function Code 0x03)

2) Force Single Coil (Function Code 0x05)

3) Preset Multiple Registers (Function Code 0x10)

The following table provides a description of the different data formats used for the Modbus registers:

5.1 Basic Measurements

Notes:

1) The range of the SOE Log Pointer is between 0 and 0xFFFFFFFF, and it is incremented by one for

every new log generated and will roll over to 0 if its current value is 0xFFFFFFFF. A value of zero
indicates that the SOE does not contain any Log. If a Clear SOE Log is performed via the Front
Panel or through communications, the SOE Log Pointer will be reset to zero.

Use the following equation to determine the latest log location:

Latest Log Location = Modulo [SOE Log Pointer / Log Depth]

2) For the I

residual

the external CT for IR1 to IR4, respectively, with “0” meaning Normal and “1” meaning
Abnormal.

3) For the Temp. Self-Diagnostic Status register, the bit values of B0 to B3 represent the status of

the external Temperature Probe for TC1 to TC4, respectively, with “0” meaning Normal and “1”
meaning Abnormal.

Table 5-1 Basic Measurements

Where SOE Log Depth = 64 (fixed)

Self-Diagnostic Status register, the bit values of B0 to B3 represent the status of

26

CET Inc.

Bit3

Bit2

Bit1

Bit0

IRn Warning

IRn Alarm

RTD Probe Fault

Residual CT Fault

Bit15

Bit14

Bit13~Bit6

Bit5

Bit4

Global Alarm

Global Fault

Reserved

TCn Warning

TCn Alarm

Register

Property

Description

Format

52000~52007

RO

Event 1

See Table 5-4
SOE Log Data

Structure

52008~52015

RO

Event 2

52016~52023

RO

Event 3

52024~52031

RO

Event 4

52032~52039

RO

Event 5

52040~52047

RO

Event 6

52048~52055

RO

Event 7

…

…

52504~52511

RO

Event 64

Offset

Property

Description

Unit

+0

RO

Log Position

0 to 63

+1

RO

High-order Byte: Event Classification2

RO

Low-order Byte: Sub-Classification2

+2

RO

Record Time: Year

0-99 (Year-2000)

RO

Record Time: Month

1 to 12

+3

RO

Record Time: Day

1 to 31

RO

Record Time: Hour

0 to 23

+4

RO

Record Time: Minute

0 to 59

RO

Record Time: Second

0 to 59

+5

RO

Record Time: Millisecond

0 to 999

+6

RO

Event Value2-Low-order Byte

+7

RO

Event Value2-High-order Byte

-

4) For the I

Alarm Status register, the bit values of B0 to B3 represent the Alarm Status of IR1

residual

to IR4, respectively, with “1” meaning Active and “0” meaning Inactive.

5) For the I

Warning Status register, the bit values of B0 to B3 represent the Warning Status of

residual

IR1 to IR4, respectively, with “1” meaning Active and “0” meaning Inactive.

6) For the Temp. Alarm Status register, the bit values of B0 to B3 represent the Alarm Status of TC1

to TC4, respectively, with “1” meaning Active and “0” meaning Inactive.

7) For the Temp. Warning Status register, the bit values of B0 to B3 represent the Warning Status of

TC1 to TC4, respectively, with “1” meaning Active and “0” meaning Inactive.

8) The table below illustrates the bit values of the Global Fault/Alarm Status register, where “1”

means Active and “0” means Inactive.

Table 5-2 Global Fault/Alarm Status Register

Bit 0/Bit 1/Bit 2/Bit 3/Bit 4/Bit 5 = 1 if there is any Residual CT/RTD Probe Fault, IRn or TCn

Alarm/Warning.
Bit14 (Global Fault) = 1 if there is either an I

or Temperature Fault.

residual

Bit 15 (Global Alarm) = 1 if there is either an IRn or TCn Alarm/Warning.

9) For the DO Status register, the bit value of B0 represents the status of DO, with “1” meaning

Active (Closed) and “0” meaning Inactive (Open).

10) If the Residual CT or RTD Probe is detected as Fault, the corresponding IRn RMS or TCn register’s

reading is 0x7FFF.

5.2 SOE Log

The SOE Log Pointer points to the register address within the SOE Log where the next event will be
stored. The following formula is used to determine the register address of the most recent SOE event
referenced by the SOE Log Pointer value:

Register Address = 52000 + Modulo(SOE Log Pointer-1/64)*8

Table 5-3 SOE Log

Notes:

1) SOE Log Data Structure

Table 5-4 SOE Log Data Structure

27

2) SOE Classification

Register

Property

Description

Format

Range, Default*

51000

RW

Alarm Buzzer

UINT16

0 = Disabled

1 = Intermittent*

2 = Continuous

51001

RW

Fault Buzzer

UINT16

0 = Disabled

1 = Intermittent*

2 = Continuous

51002

RW

Alarm Reset Mode

UINT16

0 = Manual*, 1 = Auto

51003

RW

RTD Probe Compensation

UINT16

0 = Disabled, 1 = Enabled*

51004

RW

Temp. Threshold

UINT16

0 to 45°C, 0°C*

51005

RW

I

residual

Threshold

UINT16

10 to 500 mA, 20 mA*

51006

RW

DO Pulse Width

UINT16

0 to 6000 (0.1s), 1.0s*

0=Latch Mode

51007

RW

Reserved

UINT16

-

51008

RW

IRn Alarm Setpoint

UINT16

0 = IRn RMS*

1 = IRn Fundamental

51009

RW

Reserved

UINT16 - 51010

RW

IR1 Setpoint

UINT16

See Note 1), 0*

51011

RW

IR1 Alarm Limit

UINT16

20 to 1000 mA, 500 mA*

51012

RW

IR1 Alarm Time Delay

UINT16

0 to 20s, 5s*

51013

RW

IR1 Warning Level

UINT16

0.1 to 0.8, 0.6*

Event

Classification

Sub-

Classification

Event Value

Description

1
1

Reserved

2

Reserved

3

1/0

DO Operated/Released

2

1

Triggered

Value

TC1 Alarm

2

TC2 Alarm

3

TC3 Alarm

4

TC4 Alarm

5

IR1 Alarm

6

IR2 Alarm

7

IR3 Alarm

8

IR4 Alarm

9

Reserved

10

TC1 Warning

11

TC2 Warning

12

TC3 Warning

13

TC4 Warning

14

IR1 Warning

15

IR2 Warning

16

IR3 Warning

17

IR4 Warning

18~19

Reserved

20 0 TC1 RTD Probe Fault

21 0 TC2 RTD Probe Fault

22 0 TC3 RTD Probe Fault

23 0 TC4 RTD Probe Fault

24 0 IR1 Residual CT Fault

25 0 IR2 Residual CT Fault

26 0 IR3 Residual CT Fault

27 0 IR4 Residual CT Fault

3
1 0 System Parameter Fault

2 0 Calibration Parameter Fault

3

0

Ferroelectric Fault

4

0

AD Fault

4

1 0 Setup Changed via Communication

2 0 Clear SOE via Communication

3

0

Power On

4 0 Setup Changed via Front Panel

5 0 Clear SOE via the Front Panel

CET Inc.

Table 5-5 SOE Classification

5.3 Device Setup

28

CET Inc.

51014

RW

IR1 Warning Delay

UINT16

0 to 20s, 5s*

51015

RW

IR2 Setpoint

UINT16

See Note 1), 0*

51016

RW

IR2 Alarm Limit

UINT16

20 to 1000 mA, 500mA*

51017

RW

IR2 Alarm Time Delay

UINT16

0 to 20s, 5s*

51018

RW

IR2 Warning Level

UINT16

0.1 to 0.8, 0.6*

51019

RW

IR2 Warning Time Delay

UINT16

0 to 20s, 5s*

51020

RW

IR3 Setpoint

UINT16

See Note 1), 0*

51021

RW

IR3 Alarm Limit

UINT16

20 to 1000 mA, 500 mA*

51022

RW

IR3 Alarm Time Delay

UINT16

0 to 20s, 5s*

51023

RW

IR3 Warning Level

UINT16

0.1 to 0.8, 0.6*

51024

RW

IR3 Warning Time Delay

UINT16

0 to 20s, 5s*

51025

RW

IR4 Setpoint

UINT16

See Note 1), 0*

51026

RW

IR4 Alarm Limit

UINT16

20 to 1000 mA, 500 mA*

51027

RW

IR4 Alarm Time Delay

UINT16

0 to 20s, 5s*

51028

RW

IR4 Warning Level

UINT16

0.1 to 0.8, 0.6*

51029

RW

IR4 Warning Time Delay

UINT16

0 to 20s, 5s*

51030

RW

TC1 Setpoint

UINT16

See Note 1), 0*

51031

RW

TC1 Alarm Limit

UINT16

45 to 140 °C, 100°C*

51032

RW

TC1 Alarm Time Delay

UINT16

0 to 40s, 0s*

51033

RW

TC1 Warning Level

UINT16

0.1 to 0.8, 0.6*

51034

RW

TC1 Warning Time Delay

UINT16

0 to 40s, 0s*

51035

RW

TC2 Setpoint

UINT16

See Note 1), 0*

51036

RW

TC2 Alarm Limit

UINT16

45 to 140 °C, 100°C*

51037

RW

TC2 Alarm Time Delay

UINT16

0 to 40s, 0s*

51038

RW

TC2 Warning Level

UINT16

0.1 to 0.8, 0.6*

51039

RW

TC2 Warning Time Delay

UINT16

0 to 40s, 0s*

51040

RW

TC3 Setpoint

UINT16

See Note 1), 0*

51041

RW

TC3 Alarm Limit

UINT16

45 to 140 °C, 100°C*

51042

RW

TC3 Alarm Time Delay

UINT16

0 to 40s, 0s*

51043

RW

TC3 Warning Level

UINT16

0.1 to 0.8, 0.6*

51044

RW

TC3 Warning Time Delay

UINT16

0 to 40s, 0s*

51045

RW

TC4 Setpoint

UINT16

See Note 1), 0*

51046

RW

TC4 Alarm Limit

UINT16

45 to 140 °C, 100°C*

51047

RW

TC4 Alarm Time Delay

UINT16

0 to 40s, 0s*

51048

RW

TC4 Warning Level

UINT16

0.1 to 0.8, 0.6*

51049

RW

TC4 Warning Time Delay

UINT16

0 to 40s, 0s*

51050~51120

RW

Reserved

UINT16 51121

RW

Unit ID

UINT16

1 to 247, 100*

51122

RW

Baud Rate1

UINT16

0=9600*, 1=19200

51123

RW

Comm. Config.

UINT16

0=8N2, 1=8O1, 2=8E1*

3=8N1, 4=8O2, 5=8E2

Bit15~Bit4

Bit3~Bit2

Bit1~Bit0

Reserved

00: OFF

01: DO Warning

10: No DO Warning

00: OFF

01: DO Alarm

10: No DO Alarm

Register

Property

Description

Format

Note

60000

RW

High-order Byte: Year

UINT16

0-37 (Year-2000)

Low-order Byte: Month

1 to 12

60001

RW

High-order Byte: Day

UINT16

1 to 31

Table 5-5 Basic Setup Parameters

Notes:

1) The following table illustrates the IRn/TCn Setpoint Register:

Table 5-6 IRn/TCn Setpoint Register

5.4 Time

There is one set of Time registers supported by the PMC-T402 – Year / Month / Day / Hour / Minute /
Second (Register # 60000 to 60002). All registers within a Time register set must be written in a single
transaction. Writing to the Millisecond register (60003) is optional during a Time Set operation. When
broadcasting time, the function code must be set to 0x10 (Pre-set Multiple Registers). Incorrect date
or time values will be rejected by the device. In addition, attempting to write a Time value less than
Jan 1, 2000 00:00:00 will be rejected.

29

CET Inc.

Low-order Byte: Hour

0 to 23

60002

RW

High-order Byte: Minute

UINT16

0 to 59

Low-order Byte: Second

0 to 59

60003

RW

Millisecond

UINT16

0 to 999

Register

Property

Description

Format

Note

60064

WO

Arm DO Close

UINT16

Writing “0xFF00”

to the register to

perform the

described action.

60065

WO

Execute DO Close

UINT16

60066

WO

Arm DO Open

UINT16

60067

WO

Execute DO Open

UINT16

60068~60124

WO

Reserved

UINT16

60125

WO

Buzzer Mute

UINT16

60126

WO

System Self-Diagnostic

UINT16

60127

WO

Clear SOE

UINT16

60128

WO

Arm Reset Alarm & Fault Register

UINT16

60129

WO

Execute Reset Alarm & Fault Register

UINT16

Register

Property

Description

Format

Note

60200~60219

RO

Device model1

UINT16

See Note 1

60220

RO

Firmware Version

UINT16

e.g. 10000 shows the

version is V1.00.00

60221

RO

Protocol Version

UINT16

e.g. 10 shows the

version is V1.0

60222

RO

Firmware Date: Year-2000

UINT16

e.g. 160110 means

January 10, 2016

60223

RO

Firmware Date: Month

UINT16

60224

RO

Firmware Date: Day

UINT16

60225

RO

Serial Number

UINT32

60227-60228

RO

Reserved

UINT16 60229

RO

Feature Code

UINT16

0: 4xIR+4xTC

Register

Value(Hex)

ASCII

60200

0x0050

P

60201

0x004D

M

60202

0x0043

C

60203

0x002D

-

60204

0x0054

T

60205

0x0034

4

60206

0x0030

0

60207

0x0032

2

60208-60219

0x20

Null

Table 5-8 Time Registers

5.5 Remote Control

Before executing an Open, Close or Reset command on a target register, it must be “Armed” first. This
is achieved by writing the value 0xFF00 to the appropriate register to “Arm” a particular Open, Close

or Reset operation. The Open, Close or Reset will be “Disarmed” automatically if an “Execute”
command is not received within 15 seconds after it has been “Armed”. If an “Execute” command is
received without first having received an “Arm” command, the PMC-T402 ignores the “Execute”
command and returns the 0x04 exception code.

Table 5-9 DO Control

5.6 Device Information

Table 5-10 Device Information

Notes:

1) The Device Model appears in registers 60200 to 60219 and contains the ASCII encoding of the

string “PMC-T402” as shown in the following table.

Table 5-11 ASCII Encoding of “PMC-T402”

30

Appendix A Technical Specifications

RTD Temperature Inputs (TC1, TC2, TC3, TC4)

RTD Type
PT100
Alarm Range

2-Wire PT100 (sensor not included)
0-200°C
45-140°C

Residual Current Inputs (IR1, IR2, IR3, IR4)

Standard (In)
Range

0.5mA
2-200% In

Power Supply (L/+, N/-, GND)

Standard
Burden
Frequency

95-250VAC/DC, ±10%, 47-440Hz
<1.5W
50Hz/60Hz

Digital Output

Type
Loading

Form A Mechanical Relay
3A @ 250VAC or 30VDC

Communications

Type
Baud Rate
Communication Format
Protocol

RS-485
9600bps
8E1 (8 Data Bits, Even Parity, 1 Stop Bit)
Modbus RTU

Setpoint Range

Residual Current
Temperature

20-1000mA in 1mA resolution
45-140°C in 1°C resolution

Buzzer

Decibel

70dB (measured at 1m range)

Installation Torque

Power Supply Terminals

0.6 N.m

Other Terminals

0.4 N.m

Environmental conditions

Operating Temperature
Storage Temperature
Humidity
Atmospheric Pressure
Pollution Degree

-25°C to +70°C

-40°C to +85°C
5% to 95% non-condensing
70 kPa to 106 kPa
II

Mechanical Characteristics

Mounting
Unit Dimensions
IP Rating

Panel or DIN Rail
72(L)×72(H)×87.8(D) mm
30

Residual Current CT (not included)

Load Current (Solid Core)

Load Current (Split Core)

Primary Input (Residual)
Secondary Output
Range
Overload
Accuracy
Frequency
Dielectric Strength
Operating Temperature
Storage Temperature

160A (PMC-MIR-46, Ø=46mm)
400A (PMC-MIR-80, Ø=80mm)
630A (PMC-MIR-220x50, 220x50mm)
1000A (PMC-MIR-120, Ø=120mm)
160A (CT553203, Ø=48mm)
225A (CT553303, Ø=68mm)
1A

0.5mA
2-200%
44A
Class 0.5 (Solid Core), Class 3 (Split Core)
50 / 60Hz
3kV rms @ 1 minute

-25 ~ +70°C(Solid Core), -12 ~ +45°C(Split Core)

-40 ~ +85°C(Solid Core), -25 ~ +70°C(Split Core)

RTD Temperature Sensor (not included)

Type
Range
Accuracy
Cable Length
Protective Tube Length

2-Wire PT100

-50°C to 200°C
IEC 60751 Class B
3m, 5m or 8m
300mm

Parameters

Measurement Range

Accuracy

Resolution

Residual Current

20 - 2000mA

±1%

0.1mA

Temperature

0 - 200°C

±1°C

0.1°C

CET Inc.

Accuracy

31

Appendix B Standards of Compliance

Safety Requirements

CE LVD 2014 / 35 / EU

EN 61010-1: 2010
EN 61010-2-030: 2010

Insulation
Dielectric test
Insulation resistance
Impulse voltage

IEC 60255-5-2000
2kV @ 1 minute
>100MΩ
5kV, 1.2/50µs

Electromagnetic Compatibility

Immunity Tests

Electrostatic Discharge

IEC 61000-4-2:2001 Level III

Radiated Fields

IEC 61000-4-3:2006 Level (10V/m)

Fast Transients

IEC 61000-4-4:2004 Level III

Surges

IEC 61000-4-5:2005 Level III

Conducted Disturbances

IEC 61000-4-6:1995 Level III

Magnetic Fields

IEC 61000-4-8:2001 Level IV

Oscillatory Waves

IEC 61000-4-12:1995 Level III

Mechanical Tests

Vibration Test
Response

IEC 60255-21-1:1998 Level I

Endurance

IEC 60255-21-1:1998 Level I

Shock Test
Response

IEC 60255-21-1:1998 Level I

Endurance

IEC 60255-21-1:1998 Level I

Bump Test

IEC 62052-11: 2003 Level I

CET Inc.

32

Appendix C Ordering Guide

CET Inc.

33

CET Inc.

Contact us

CET Inc.
8/F, Westside, Building 201, Terra Industrial & Tradepark,
Che Gong Miao, Shenzhen, Guangdong, P.R.China 518040
Tel: [phone]
Fax: [phone]
Email: [e-mail]
Web: www.cet-global.com

34